How to Test Merge Fields In A Mailing

How can an email campaign mailing that has merge fields in its content be tested to verify the fields are merging in data correctly?

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Number:57029

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Blackbaud_Sphere

This cannot be verified by simply sending a test mailing to yourself. You will need to send the actual email campaign mailing out and verify once the email is received. If this needs to be tested before sending to the entire receiver list, then a test mailing should be created using just your own Sphere contact record in the receiver query.